Well I always said I wasnt a fan of Por15. But my experiences with it are from almost 30 years ago. I decided to give it a shot again. Did 2 coats on the inside of the framerail as far as an acid brush could reach. Then after heat gun drying it, I applied 3 brush coats of epoxy primer. The weld overlap areas got zinc weld thru primer, and the prerequisite 1/4" holes for rosette welds. I will weld it up and grind it down tomorrow evening. Then turn my attention towards the fwd framerail top cap next. am very pleased with the results so far. The rest of the inside of the framerail is in good shape. I ran my borescope down through it and the metal is solid with only light surface rust in spots. This car lives in a dry environment and I plan on shooting a rust inhibitor inside the rails when all is said and done anyways.